WO2009049622A1 - A method of manufacturing wood panel - Google Patents

A method of manufacturing wood panel Download PDF

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Publication number
WO2009049622A1
WO2009049622A1 PCT/DK2008/000361 DK2008000361W WO2009049622A1 WO 2009049622 A1 WO2009049622 A1 WO 2009049622A1 DK 2008000361 W DK2008000361 W DK 2008000361W WO 2009049622 A1 WO2009049622 A1 WO 2009049622A1
Authority
WO
WIPO (PCT)
Prior art keywords
veneers
wood panel
motor
driven
chain arrangement
Prior art date
Application number
PCT/DK2008/000361
Other languages
French (fr)
Inventor
Stefan Krebs Jensen
Markus Hofmann
Original Assignee
Obel-P Automation A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Obel-P Automation A/S filed Critical Obel-P Automation A/S
Priority to EP08801395A priority Critical patent/EP2212068A1/en
Publication of WO2009049622A1 publication Critical patent/WO2009049622A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood

Definitions

  • the present invention relates to a method of manufacturing a straight-edged wood panel consisting of joined veneers having varying lengths, said veneers to be fed into a press during a continuous process.
  • Veneers for the manufacture of wood panels vary in length. This means that newly compressed laminated wood panels have two serrated edges which must be trimmed with respect to the width in a double tenoner or the like.
  • the object of the present invention is to provide a method of simplifying said trimming.
  • a method of the type disclosed in the preamble is characterised by the veneers being aligned laterally in two stages, preferably by means of a motor-driven chain arrangement, prior to being fed into the press, a rough alignment being carried out by means of a motor-driven aligning wheel correcting comparatively large lateral displacements between the veneers during a first stage, and a more precise lateral alignment being executed in a second stage by means of a tapping unit pressing each veneer against the chain arrangement.
  • one side of the wood panel is rendered straight, so that only the other side of the panel is serrated. Therefore, only one side, i. e. the serrated side, has to be machined and hence machining waste is reduced.
  • Fig. 1 shows an apparatus for carrying out the method according to the present invention comprising a motor-driven chain arrangement and an aligning wheel and a tapping unit,
  • Fig. 2 shows the chain arrangement on a larger scale
  • Fig. 3 shows the aligning wheel and the tapping unit on a larger scale
  • Fig. 4 is a more detailed view of the chain arrangement
  • Fig. 5 is a more detailed view of the tapping unit.
  • the apparatus illustrated in Fig. 1 for manufacturing a straight-edged wood panel by means of a plurality of joined veneers 2 having varying lengths is in the form a production line, the veneers 2 being conveyed along said production line in such a manner as to be perpendicular to the conveying direction.
  • a space has to be provided between the veneers continuously supplied and the veneers for alignment.
  • a pneumatically activated gripper 4 is provided, retaining the continuously conveyed veneers, while a number of veneers already conveyed are aligned on the right-hand side of the gripper 4.
  • a motor-driven chain arrangement 6 is illustrated at the bottom of Fig.
  • a motor-driven aligning wheel 8 is illustrated at the top of Fig. 1.
  • the peripheral speed of the aligning wheel 8 is slightly higher than the conveying speed of the chain arrangement 6.
  • a rough alignment is achieved by means of the aligning wheel 8.
  • a pneumatically activated tapping unit 10 consisting of an actuator and a pivotable projecting arm 11 the end of said arm being provided with a comparatively small pivotable roller 12.
  • the tapping pressure is approximately 1-7 bar.
  • the tapping frequency is approxi- mately several few Hz, corresponding to each veneer being tapped approximately 3 times, depending on the friction between the veneers 2. This results in a more precise lateral alignment.
  • the veneers 2 are engaged by the feed caterpillars of the press, and a chain arrangement in the first part of the press ensures that the alignment of the veneers is maintained.
  • Fig. 4 shows a more detailed view of the chain arrangement.
  • the chain arrangement is driven by means of a chain 25 running on a slide rail 27 against which the end of each veneer 2 is pressed when being manipulated by the aligning wheel 8.
  • the chain 25 is driven by a sprocket 26 connected to an electric motor 21 by means of a shaft and a gear 22.
  • Fig. 5 shows a more detailed view of the tapping unit 10.
  • the aligning wheel 8 ensuring a rough alignment of the veneers 2 is suspended in a spiral bevel gear 33 and driven by an electric motor 32 via the spiral bevel gear 33.
  • the spiral bevel gear 33 is suspended on a panel 36 mounted in a guide rail 35, the aligning wheel 8 thus being movable in the longitudinal direction of each veneer 2 and hence being able to accommodate the varying lengths of the ve- neers 2 comprising typically up to 25 mm.
  • a pneumatic cylinder 37 ensures that the aligning wheel 8 is constantly pressed against the veneers 2.
  • the aligning wheel exerts pressure against the ends of the veneers, said pressure being controllable by changing the pressure of the pneumatic cylinder 37.
  • the pressure can be adjusted between 1 and 6 bar. The longer the veneers 2, the higher the pressure necessary to overcome the friction between the veneers 2.
  • the tapping unit 10 also driven by means of a pneumatic cylinder 32 is provided with a small wheel 38 at its end, so that a veneer 2 is not decelerated when the tapper 39 is in contact with said veneer.
  • the tapper 39 is suspended in a guide rail 40 and a guide carriage 30, and is driven by means of a pneumatic cylinder 32 via an arm 31 projecting upwards, said arm being permanently fixed to the tapper 39.
  • the tapping interval is controlled by a change-over valve (not shown) and a master control of the entire plant.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Abstract

A method of manufacturing a straight-edged wood panel consisting of joined veneers having varying lengths, said veneers to be fed into a press during a continuous process. Prior to being fed into the press the veneers are aligned laterally in two stages by means of a motor-driven chain arrangement, a rough alignment being carried out by means of a motor-driven aligning wheel (8) correcting comparatively large lateral displacements between the veneers during a first stage, and a more precise lateral alignment being executed in a second stage by means of a tapping unit (10) pressing each veneer against the chain arrangement. Thus, one side of the laminated wood panel is rendered straight, so that only the other side of the panel is serrated. Therefore, only one side, i. e. the serrated side, has to be machined and hence machining waste is reduced.

Description

Title: Method of manufacturing wood panel
Technical Field
The present invention relates to a method of manufacturing a straight-edged wood panel consisting of joined veneers having varying lengths, said veneers to be fed into a press during a continuous process.
Background Art
Veneers for the manufacture of wood panels vary in length. This means that newly compressed laminated wood panels have two serrated edges which must be trimmed with respect to the width in a double tenoner or the like.
The object of the present invention is to provide a method of simplifying said trimming.
According to the present invention, a method of the type disclosed in the preamble is characterised by the veneers being aligned laterally in two stages, preferably by means of a motor-driven chain arrangement, prior to being fed into the press, a rough alignment being carried out by means of a motor-driven aligning wheel correcting comparatively large lateral displacements between the veneers during a first stage, and a more precise lateral alignment being executed in a second stage by means of a tapping unit pressing each veneer against the chain arrangement.
Thus, one side of the wood panel is rendered straight, so that only the other side of the panel is serrated. Therefore, only one side, i. e. the serrated side, has to be machined and hence machining waste is reduced.
The dependent claims refer to particularly suitable embodiments of the method. Brief Description of the Drawing
The invention is explained in detail below and with reference to the drawings.
Fig. 1 shows an apparatus for carrying out the method according to the present invention comprising a motor-driven chain arrangement and an aligning wheel and a tapping unit,
Fig. 2 shows the chain arrangement on a larger scale,
Fig. 3 shows the aligning wheel and the tapping unit on a larger scale,
Fig. 4 is a more detailed view of the chain arrangement, and
Fig. 5 is a more detailed view of the tapping unit.
Best Mode for Carrying out the Invention
The apparatus illustrated in Fig. 1 for manufacturing a straight-edged wood panel by means of a plurality of joined veneers 2 having varying lengths is in the form a production line, the veneers 2 being conveyed along said production line in such a manner as to be perpendicular to the conveying direction. During conveyance, a space has to be provided between the veneers continuously supplied and the veneers for alignment. For this purpose, a pneumatically activated gripper 4 is provided, retaining the continuously conveyed veneers, while a number of veneers already conveyed are aligned on the right-hand side of the gripper 4. For this purpose, a motor-driven chain arrangement 6 is illustrated at the bottom of Fig. 1 and a motor-driven aligning wheel 8 is illustrated at the top of Fig. 1. The peripheral speed of the aligning wheel 8 is slightly higher than the conveying speed of the chain arrangement 6. A rough alignment is achieved by means of the aligning wheel 8. Following the aligning wheel 8, there is provided a pneumatically activated tapping unit 10 consisting of an actuator and a pivotable projecting arm 11 the end of said arm being provided with a comparatively small pivotable roller 12. The tapping pressure is approximately 1-7 bar. The tapping frequency is approxi- mately several few Hz, corresponding to each veneer being tapped approximately 3 times, depending on the friction between the veneers 2. This results in a more precise lateral alignment.
Then, the veneers 2 are engaged by the feed caterpillars of the press, and a chain arrangement in the first part of the press ensures that the alignment of the veneers is maintained.
Fig. 4 shows a more detailed view of the chain arrangement. The chain arrangement is driven by means of a chain 25 running on a slide rail 27 against which the end of each veneer 2 is pressed when being manipulated by the aligning wheel 8. The chain 25 is driven by a sprocket 26 connected to an electric motor 21 by means of a shaft and a gear 22.
Fig. 5 shows a more detailed view of the tapping unit 10. The aligning wheel 8 ensuring a rough alignment of the veneers 2 is suspended in a spiral bevel gear 33 and driven by an electric motor 32 via the spiral bevel gear 33. The spiral bevel gear 33 is suspended on a panel 36 mounted in a guide rail 35, the aligning wheel 8 thus being movable in the longitudinal direction of each veneer 2 and hence being able to accommodate the varying lengths of the ve- neers 2 comprising typically up to 25 mm. A pneumatic cylinder 37 ensures that the aligning wheel 8 is constantly pressed against the veneers 2. The aligning wheel exerts pressure against the ends of the veneers, said pressure being controllable by changing the pressure of the pneumatic cylinder 37. The pressure can be adjusted between 1 and 6 bar. The longer the veneers 2, the higher the pressure necessary to overcome the friction between the veneers 2.
The tapping unit 10 also driven by means of a pneumatic cylinder 32 is provided with a small wheel 38 at its end, so that a veneer 2 is not decelerated when the tapper 39 is in contact with said veneer. The tapper 39 is suspended in a guide rail 40 and a guide carriage 30, and is driven by means of a pneumatic cylinder 32 via an arm 31 projecting upwards, said arm being permanently fixed to the tapper 39. The tapping interval is controlled by a change-over valve (not shown) and a master control of the entire plant.

Claims

Claims
1. A method of manufacturing a straight-edged wood panel consisting of joined veneers (2) having varying lengths, said veneers to be fed into a press (13) during a continuous process, characterised by the veneers (2) being aligned laterally in two stages, preferably by means of a motor-driven chain arrangement (6), prior to being fed into the press (13), a rough alignment being carried out by means of a motor-driven aligning wheel (8) correcting comparatively large lateral displacements between the veneers (2) during a first stage, and a more precise lateral alignment being executed in a second stage by means of a tapping unit (10) pressing each veneer against the chain arrangement.
2. The method according to claim 1 , characterised by the motor-driven align- ing wheel (8) having a diameter of approximately twice the width of each veneer (2).
3. The method according to claim 1 , characterised by the tapping unit (10) having an arm (11 ) being in an oblique position with respect to the longitudinal direction of the laminated wood panel.
4. The method according to claim 3, characterised by the obliquely positioned arm (11 ) being provided with a comparatively small wheel (12) at the end.
5. The method according to claim 3 or 4, characterised by the tapping unit (10) tapping with a frequency considerably higher than the number of veneer tops per second at the relevant conveying speed of the laminated wood panel.
PCT/DK2008/000361 2007-10-15 2008-10-14 A method of manufacturing wood panel WO2009049622A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08801395A EP2212068A1 (en) 2007-10-15 2008-10-14 A method of manufacturing wood panel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200701481 2007-10-15
DK200701481A DK176756B1 (en) 2007-10-15 2007-10-15 Process for making a glulam board

Publications (1)

Publication Number Publication Date
WO2009049622A1 true WO2009049622A1 (en) 2009-04-23

Family

ID=40227729

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2008/000361 WO2009049622A1 (en) 2007-10-15 2008-10-14 A method of manufacturing wood panel

Country Status (3)

Country Link
EP (1) EP2212068A1 (en)
DK (1) DK176756B1 (en)
WO (1) WO2009049622A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977199A (en) * 1933-05-31 1934-10-16 George H Osgood Art of making crossing sheets of plywood panels
US3118802A (en) * 1959-06-11 1964-01-21 Thomas C Bird Machine for forming a panel consisting of a compressed multiple piece core having flexible sheet facings
CH429121A (en) * 1965-06-04 1967-01-31 Fischer Ag Brugg Georg Veneer loading device for a veneer splicing machine for gluing veneers
US3919954A (en) * 1972-03-27 1975-11-18 Coe Mfg Co Apparatus and method for handling and processing green wood veneer in the manufacture of plywood
DE2606289A1 (en) * 1975-02-27 1976-09-16 Fischer Ag Brugg Georg Single sheet wood veneer joining machine - has resilient veneer guiding rollers and conveyor belt pressure rollers
DE2811054A1 (en) * 1977-03-18 1978-09-21 Fischer Ag Brugg Georg DEVICE FOR MACHINING LONG EDGE ON VARIOUS WIDTH WORKPIECES

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977199A (en) * 1933-05-31 1934-10-16 George H Osgood Art of making crossing sheets of plywood panels
US3118802A (en) * 1959-06-11 1964-01-21 Thomas C Bird Machine for forming a panel consisting of a compressed multiple piece core having flexible sheet facings
CH429121A (en) * 1965-06-04 1967-01-31 Fischer Ag Brugg Georg Veneer loading device for a veneer splicing machine for gluing veneers
US3919954A (en) * 1972-03-27 1975-11-18 Coe Mfg Co Apparatus and method for handling and processing green wood veneer in the manufacture of plywood
DE2606289A1 (en) * 1975-02-27 1976-09-16 Fischer Ag Brugg Georg Single sheet wood veneer joining machine - has resilient veneer guiding rollers and conveyor belt pressure rollers
DE2811054A1 (en) * 1977-03-18 1978-09-21 Fischer Ag Brugg Georg DEVICE FOR MACHINING LONG EDGE ON VARIOUS WIDTH WORKPIECES

Also Published As

Publication number Publication date
DK200701481A (en) 2009-04-16
EP2212068A1 (en) 2010-08-04
DK176756B1 (en) 2009-06-22

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